Activity 5: Density

To complete Activity 5, complete the tasks below:

     1.    Run the Build an Atom simulation http://phet.colorado.edu/en/simulation/build-an-atom and build a neutral lithium atom and a neutral boron atom.  Take a picture, or a screen shot, of these two atoms and place them on your blog.  List the number of protons, neutrons and electrons for each. Also look up and post the density for each of the elements on your blog.

Boron: 5 Protons, 6 Neutrons, and 5 Electrons

Density of Boron: 2.08 g·cm⁻³

Lithium: 3 Protons, 4 Neutrons, and 3 Electrons

Density of Lithium: 0.512 g·cm⁻³

    2.    Define density and the equation for density and post on your blog.

 Density is the mass an object, an atom for example, has per unit of volume.  So the more closely packed the atoms of a certain element are, the denser it will be.  The number of protons and neutrons determine the weight of an atom as well, due to the fact that most of all atoms’ volume is empty space. Density is determined using the equation:

            Or p=m/V, Density=mass/Volume

3. Run the Density simulation http://phet.colorado.edu/en/simulation/density and complete one (your choice) of the prepared Teaching Ideas and post your results on your blog. The activity you choose should be one of the student intended activities.

4. Complete the Mystery Blocks activity on the Density simulation.  Post on your blog the data you collected (mass, volume, and density) and the identification of the material and the known density.

Blocks.	Mass (kg).	Volume (L).	Density (kg/L).	Material.	Known density.
A.	65.14 kg.	3.38 L.	19.27 kg/L.	Gold.	19.3 kg/L.
B.	0.64 kg.	0.64 L.	1.00 kg/L.	Water.	1.00 kg/L.
C.	4.08 kg.	4.08 L.	1.00 kg/L.	Water.	1.00 kg/L.
D.	3.10 kg.	3.10 L.	1.00 kg/L.	Water.	1.00 kg/L.
E.	3.53 kg.	1.00 L.	3.53 kg/L.	Diamond.	3.53 kg/L.

5. Identify and post on your blog the Science Standards that could be met through these activities completed in Activity 5

A.4.2 When faced with a science-related problem, decide what evidence, models, or explanations previously studied can be used to better understand what is happening now

C.4.2 Use the science content being learned to ask questions, plan investigations, make observations, make predictions, and offer explanations

D.4.2 Group and/or classify objects and substances based on the properties of earth materials

E.4.3 Develop descriptions of the land and water masses of the earth and of Wisconsin's rocks and minerals, using the common vocabulary of earth and space science